<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>作业班级学生数据联动</title>
</head>

<body>

  班级
  <select id="selbj"></select>

  学生
  <select id="selxs"></select>

  <script type="module" src="../js/zuoye1.js"></script>
</body>

</html>